160 lines
2.9 KiB
Bash
160 lines
2.9 KiB
Bash
#!/bin/bash
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# @(#) dirstack
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###
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# Another implementation of the directory manipulation functions
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# published in the Bolsky & Korn book : "The new Korn shell" :
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# cd, to change current directory
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# d, to display the stack content
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# Eric Sanchis (eric.sanchis@iut-rodez.fr), 2012
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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###
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shopt -s expand_aliases
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shopt -s extglob
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shopt -s cdable_vars
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alias integer='declare -i'
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integer MAX=32
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integer INDMAX=MAX-1
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integer INDTOP=0
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unalias cd 2>/dev/null
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alias cd=cdir
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unset tab
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tab[INDTOP]="$(pwd)"
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function cdir
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{
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local -i ind
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local dir
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dir="${1:-$HOME}"
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case "$dir" in
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- ) # cd - => equivalent to : cd -1
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ind=INDTOP-1
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cd_by_number $ind
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;;
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-+([[:digit:]]) ) # cd -n
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ind=$INDTOP-${dir#-}
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cd_by_number $ind
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;;
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*) # cd ~ or cd dir_name
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cd_by_name "$dir"
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esac
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}
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function cd_by_number
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{
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local -i k=$1
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local -i j
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local dirtmp
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if (( k < 0 ))
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then
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echo Impossible to change directory >&2
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return 1
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else
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dirtmp="${tab[k]}"
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j=k+1
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while (( j <= INDTOP ))
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do
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tab[j-1]="${tab[j]}"
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j=j+1
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done
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tab[INDTOP]="$dirtmp"
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\cd "${tab[INDTOP]}"
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fi
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}
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function cd_by_name
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{
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local -i i
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local rep
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rep=$( \cd "$1" &>/dev/null && pwd)
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if [[ -z "$rep" ]]
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then
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echo cd : "$1" unknown >&2
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return 1
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fi
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i=$INDTOP
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while (( i >= 0 ))
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do
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if [[ "${tab[i]}" == "$rep" ]]
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then break
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fi
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i=i-1
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done
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if (( i == INDTOP ))
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then # cd -0 => we do nothing !
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return 0
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elif (( i == -1 ))
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then # the directory isn't in the stack
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if (( INDTOP == INDMAX ))
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then # the stack is FULL
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# the oldest directory is removed
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local -i m
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m=1
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while (( m <= INDMAX ))
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do
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tab[m-1]="${tab[m]}"
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m=m+1
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done
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else # the new directory is added to the top of the stack
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INDTOP=INDTOP+1
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fi
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tab[INDTOP]="$rep"
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\cd "${tab[INDTOP]}"
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return 0
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else # the directory is already in the stack
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# $i gives its index
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cd_by_number $i
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fi
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}
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function d # display the directory stack
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{
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local -i i
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local rep
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i=0
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while (( $i <= $INDTOP ))
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do
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rep="${tab[INDTOP-i]#$HOME/}"
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case "$rep" in
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$HOME) rep="~" ;;
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/* ) : ;;
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* ) rep="~/$rep"
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esac
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echo "$i ) $rep"
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i=i+1
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done
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}
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